I'm traveling and I don't have access to my manual, so I'm sorry if it's in there. I flip between modes a lot and tend to use full auto (when family doesn't have patience for me to set something up). ...
I have D5100 and D5200 both. When I am using remote shutter release cable for star trail, without bulb mode, both cameras take only 100 images at a stretch. I even tried with 1/4000 shutter speed, but ...